When was the first sound recording made? Detailed answer

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When was the first sound recording made? Detailed answer

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When was the first sound recording made?

The first sound recording was made by Thomas Edison in 1877. His first sound recording machine had a cylinder that turned with a knob. It also had a horn and a blunt needle. From the narrow end, the horn was closed with a flexible membrane. Sounds entering from the wide side of the horn caused vibrations of this membrane, to which the needle was attached. The needle moved up and down under the influence of sounds.

The cylinder was covered with a layer of tin foil. The needle was pressed into this foil, and the horn, along with the needle, slowly moved along the cylinder as the handle was turned. Thus, by going around the cylinder many times, the needle squeezed out a track on the foil. When someone spoke or sang into the horn, the needle moved up and down. Descending, the needle made deeper grooves in the foil, and rising, smaller ones. The change in the depth of the grooves was a reflection of the sound waves produced during speech or singing.

This is how the sound was recorded. To reproduce the recording, the horn with the needle was moved back to the beginning of the groove. When the needle moved along the groove, it caused the thin membrane to vibrate in the same sequence as when writing. This caused the air in the horn to vibrate, which was the cause of the sound, reminiscent of the one that sounded during the recording!

Author: Likum A.

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